light-weight

KeePass for J2ME is a J2ME port of KeePass Password Safe, a free, open source, light-weight and easy-to-use password manager. You can store passwords in a highly-encrypted database on a mobile phone, and view them on the go.

light-weight adjective
light in weight,輕量的

不過在這裡翻譯成 "小巧玲瓏" 也不錯。